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Leaking Yanmar fresh water cooler cover

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Leaking Yanmar fresh water cooler cover

Old 05-17-2019, 04:20 PM
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Default Leaking Yanmar fresh water cooler cover

My Yanmar 6LPA-STZP has four zincs that are easy to replace, but one bear. The pesky one is on the rear cover plate for the fresh water cooler. To replace it, I have to take off the hose to the cooler and the cooler cover plate. The cover plate is held on by a single bolt and a large gasket seals the end of the heat exchanger. In putting the assembly back on, I cannot seem to keep it from leaking. Putting the hose back on is difficult, and it is not easy to get at the single bolt. This bolt, by the way, has an "O" ring squeezes between the bolt and the cover plate. I think. Anyway, tried three times so far to put this back together and everytime it still leaks. Having banged up my arm and hand, am taking a break, and trying to get it right next time.
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Old 05-18-2019, 06:22 PM
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On staring at the old parts, I suddenly realize what I think the problem is. See the depression in the old gasket and the cover plate? There is some sort of washer which should go in there. Absent that washroom, I’m guessing leakage occurs.
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Old 05-18-2019, 06:50 PM
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Originally Posted by Nitzey View Post
On staring at the old parts, I suddenly realize what I think the problem is. See the depression in the old gasket and the cover plate? There is some sort of washer which should go in there. Absent that washroom, I’m guessing leakage occurs.

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Old 05-18-2019, 06:57 PM
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Now, where did I drop that washer?
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Old 05-18-2019, 07:30 PM
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Yes I think there is a rubber oring that goes there, cant remember for sure right now. Can prob see it on an exploded diagram. My engine also has 6 zincs and one on the gearbox cooler strange yours only has 4. And yes that one is the hardest one to reach...I generally try to do that one first to get it out of the way
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Old 05-19-2019, 03:58 AM
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Washer goes between end cover and gasket. When reinstalling hose fitting must be in exact position when removed.
I don't change that zinc because the heat exchanger has two on opposite end
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Old 05-19-2019, 05:13 AM
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I always have fun with that one!
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Old 05-19-2019, 05:44 PM
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I sure wish I could find an exploded diagram, but failed. Will visit Mastery Engine, a Yanmar company, tomorrow. If anybody has it, or the correct information, they should. I was wondering if it is possible to line up the hose and zinc so that in the future the zinc could be removed without taking off the hose. However, so far have been stymied; think I cannot do this.
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Old 05-20-2019, 07:05 PM
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For the record that was the problem. Now have success.
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